Abstract
The as-cast Mg-14Li-1Zn alloy was hot rolled at different temperatures with the reduction of 50%, followed by cold rolling with the reduction of 80%. The effects of the hot rolling temperature on the microstructure and mechanical properties of the final specimens were investigated. The results show that the higher rolling temperature brings about a more homogeneous microstructure, which is favorable for the subsequent cold rolling. When the hot rolling temperature is 300°C, the final specimen possesses the highest tensile strength and hardness of 238 MPa and 67.7 HV, respectively. When the hot rolling temperature is 200°C, the final specimen possesses the highest elongation of 24.6%.
Highlights
Mg-Li base alloys have been attracting more and more attention from researchers. e existence of Li element causes a low density of the alloys, 1.35–1.65 g/cm3, which is very appealing for the application in the fields of aerospace and weapon equipment
When Li content is larger than 10.3 wt.%, the matrix of the Mg-Li alloy is a single phase with the bodycentered cubic (BCC) structure [2]. e single-phase Mg-Li alloys with the BCC structure always possess a relatively low strength
E microstructure of the specimen was observed with optical microscopy (OM) and transmission electron microscopy (TEM). e specimen for OM is mechanically polished and is etched with 3 vol.% nital. e fracture microstructure was observed with scanning electron microscopy (SEM)
Summary
Mg-Li base alloys have been attracting more and more attention from researchers. e existence of Li element causes a low density of the alloys, 1.35–1.65 g/cm3, which is very appealing for the application in the fields of aerospace and weapon equipment. The strategy is to combine the advantages of both cold rolling and hot rolling, so as to obtain the high Li content Mg-Li alloys with good comprehensive mechanical properties. E effects of the hot rolling on the microstructure and mechanical properties of the final cold-rolled Mg-14Li-1Zn alloy were investigated.
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